there is a remote control to operate it- some are wired remotes, some are wireless. But even the wired remotes are disconnected when not in use. So no, you don't have that to worry about.
However. There is a lever to "free spool" it. This is for pulling the cable out to hook up. Anyone can walk up, switch it to free spool, and wind your cable out.
I've always thought it would be a really mean trick to spool out a bunch of cable, hook it to a parked car, then switch it back. When the driver of either vehicle then backed out of their space- OUCH!